| PEOPLE | St. Louis | Warrenville | United States |
| Population | 319,294 | 13,140 | 308,035,306 |
| Pop. Density | 5,157 | 2,407 | 87 |
| Pop. Change | -8.82% | -1.80% | 8.07% |
| Median Age | 34.1 | 36.5 | 37.3 |
| Households | 142,057 | 4,890 | 116,716,292 |
| Household Size | 2.16 | 2.64 | 2.58 |
| Male Population | 48.28% | 49.74% | 49.27% |
| Female Population | 51.72% | 50.26% | 50.96% |
| Married Population | 25.76% | 54.30% | 47.02% |
| Single Population | 74.24% | 45.70% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.60% | 6.96% | 6.56% |
| Age 5 to 9 | 5.44% | 6.77% | 6.61% |
| Age 10 to 14 | 5.30% | 6.80% | 6.71% |
| Age 15 to 17 | 3.81% | 4.31% | 4.21% |
| Age 18 to 20 | 3.25% | 2.44% | 2.95% |
| Age 21 to 24 | 9.04% | 5.97% | 7.01% |
| Age 25 to 34 | 18.06% | 14.72% | 13.33% |
| Age 35 to 44 | 12.60% | 13.60% | 13.33% |
| Age 45 to 49 | 14.03% | 16.98% | 14.61% |
| Age 50 to 54 | 14.03% | 16.98% | 14.61% |
| Age 55 to 59 | 10.84% | 12.98% | 11.84% |
| Age 60 to 64 | 10.84% | 12.98% | 11.84% |
| Age 65 to 74 | 5.54% | 5.21% | 7.05% |
| Age 75 to 84 | 3.79% | 2.43% | 4.24% |
| Age 85 and over | 1.68% | 0.84% | 1.78% |
| RACE | | | |
| White | 43.93% | 82.19% | 72.41% |
| Black | 49.22% | 3.91% | 12.61% |
| Asian | 2.91% | 3.70% | 4.75% |
| American Indian | 0.26% | 0.61% | 0.95% |
| Other | 3.68% | 9.59% | 9.28% |
| Hispanic | 5.02% | 0.00% | 16.35% |
| Non-Hispanic | 94.98% | 100.00% | 83.65% |
| FAMILY | | | |
| Married, w/children | 17.68% | 36.16% | 30.42% |
| Married, no children | 31.17% | 42.36% | 42.46% |
| Single, w/children | 26.33% | 10.90% | 14.39% |
| Single, no children | 24.82% | 10.58% | 12.73% |
| Divorced | 13.01% | 11.74% | 10.62% |
| Separated | 6.13% | 2.33% | 4.97% |
| Widowed | 7.75% | 2.41% | 6.14% |
| Now Married | 25.42% | 53.70% | 46.32% |
| Never Married | 47.68% | 29.83% | 31.95% |
